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The Almond Biscuit
Preheat the oven to 180°C and line a rectangular baking tin with parchment paper; mine is 40 by 25 cm and just under 2 cm high.
Whip the egg whites with the sugar until very stiff.
Sift the ground almonds, icing sugar, and flour together until there are no lumps.
Gently fold this dry mixture into the whipped egg whites in two batches. Always work from bottom to top to preserve the air you've just incorporated.
Spread the batter evenly in the baking tin, to a thickness of about 1 cm.
Bake for 30 minutes at 180°C.
Let it cool completely, then loosen the sides so the biscuit comes out of the tin easily.
The Vanilla Buttercream
Whip the egg yolks with the vanilla until light yellow and airy.
Heat the water and fine sugar on the hob and bring to a boil until it reaches 118°C (use a sugar thermometer).
Carefully pour the hot syrup in a steady stream into the whipped yolks, continuing to beat until it reaches approximately body temperature.
Add the butter in pieces while continuing to beat, until you get a smooth, creamy buttercream.
- Too runny? Then your foam was still too warm when the butter was added.
- Put it in the fridge for a short while and then simply whip it up again.
- Is it curdling or clumping? Then your butter or the whole mixture was too cold: briefly warm the sides of your bowl with a blowtorch and beat again until you get a beautiful soft foam.
Assembly
Peel the parchment paper off the biscuit. Note: the side you peel the paper from will be smooth and become the top. Cut the biscuit into two equal halves.
Place the first half on a piece of parchment paper, smooth side down.
Spread the miso evenly over the biscuit in a thin layer.
Put the buttercream in a piping bag and distribute it in even lines over this piece of biscuit with miso.
Place the second half on top, with what was previously the bottom now facing up.
Press down gently, using the sides of the parchment paper to keep everything in shape.
Let it firm up in the refrigerator for 1 to 2 hours.
Trim the sides straight with a warm bread knife that you dip in warm water each time.
Generously dust the top with icing sugar and use your hand to fill in any small holes. Wipe away excess sugar.
Finish with a generous layer of icing sugar.
Decorate one corner with a little cocoa powder.
Cut into pieces with a wet, warm knife, wiping the knife clean after each cut.
Tips
- Definitely use a candy thermometer for the syrup. That 118°C is crucial for a stable buttercream.
- Are you unsure about the miso? Start with a small amount and taste; you can always add more.
- Always cut with a warm, wet knife and clean it between each cut to get the neatest, sharpest pieces.